Ohio Rev. Code § 6119.31
The board of county commissioners at any time not less than ninety days before the general election in any year, by a vote of two-thirds of its members, may declare by resolution that the amount of taxes which may be raised within the ten-mill limitation will be insufficient to provide an adequate amount for the necessary requirements of the county, and that it is necessary to levy a tax in excess of such limitation for the purpose of paying the cost of the preparation of plans, specifications, surveys, soundings, drillings, maps, and other data needed or determined necessary in order to develop plans for the proper purification, filtration, and distribution of water or proper collection and treatment of sewage within the county or a part thereof, or beyond the limits of the county but within the same drainage area as is in part within the county.
Such resolution shall be confined to a single purpose and shall specify the amount of increase in rate which it is necessary to levy, not to exceed three-tenths of a mill, the purpose thereof, the number of years during which such increase shall be in effect, not to exceed five years, which increase may or may not include a levy upon the duplicate of the current year.
Such resolution shall go into effect upon its passage and no publication of it is necessary other than that provided for in the notice of election.
R.C. § 6119.31